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From: dave@murphy.UUCP
Newsgroups: comp.arch
Subject: PDP-11 compatibility mode in Vaxen
Message-ID: <48@houligan.UUCP>
Date: Fri, 16-Jan-87 17:25:08 EST
Article-I.D.: houligan.48
Posted: Fri Jan 16 17:25:08 1987
Date-Received: Fri, 23-Jan-87 22:38:39 EST
Organization: Gould Electronics, Ft. Lauderdale, Florida.
Lines: 24

Actually, I believe Data General went them one better.  When the first of
the Eclipse/MV machines came out, they had the ability to execute the
instructions of the older 16-bit Eclipse machines *without going into a
compability mode*!  (I think they did this be designing the MV instruction
set around the older set, so that all of the older set's opcodes remained
the same.  Probably made the instruction set a bit messy... oh, well...)
Since they already had AOS running on some of the older machines,
porting their applications to the MV's consisted solely of copying the
binaries.  I don't know how well this worked, either technically or as
a marketing point.

(Disclaimer: I do not and have not ever worked for DG.)

---
"I used to be able to sing the blues, but now I have too much money."
-- Bruce Dickinson

Dave Cornutt, Gould Computer Systems, Ft. Lauderdale, FL
UUCP:  ...!{sun,pur-ee,brl-bmd,bcopen}!gould!dcornutt
 or ...!{ucf-cs,allegra,codas}!novavax!houligan!dcornutt
ARPA: dcornutt@gswd-vms.arpa (I'm not sure how well this works)

"The opinions expressed herein are not necessarily those of my employer,
not necessarily mine, and probably not necessary."